What do we mean when we say that the terrestrial worlds underwent differentiation?

Which of these marketing methods henry ford sell the model t to many people who had never before owned a car? a) offering free maintenance on cars for a full year b) airing television commercials with memorable slogans c) advertising with the new communication outlets such as radio d) offering many different colors and models for buyers to choose from

Which of the follow modern activities would only have been possible after the neolithic revolution

Explain the significance of martin luther king jr's letter from a birmingham jail and i have a dream speech